Find slope of line (I need to see if you get the same answer as me to know if it’s right)

Which ahows the graph of the solution set of 6x+4y< 12

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn. if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).